IBM 1401 change log

This log starts with ibm1401Music4.

1. modify to support tempo 1 - 5 where tempo 5 is the same as music3
2. Move move data area to be within the first 4K bank of 1401 memory
3. Change note of silence from top note to lowest note
4. add a 555 555 stop before playing
5. Have repeate on SS G
6. Support multiple songs.